667_Physics ProblemsTechnical Physics

667_Physics ProblemsTechnical Physics - Chapter 23 P23.10 x...

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Chapter 23 7 P23.10 Let the third bead have charge Q and be located distance x from the left end of the rod. This bead will experience a net force given by Fi i =+ kq Q x kqQ dx ee 3 22 bg b g a f ej ±± . The net force will be zero if 31 x = a f , or x −= 3 . This gives an equilibrium position of the third bead of xd = 0634 . . The equilibrium is stable if the third bead has positive charge . P23.11 (a) F ke r e ==× × × 2 2 9 19 2 10 2 8 899 10 160 10 0529 10 822 10 . . . . Nm C C m N (b) We have F mv r = 2 from which v Fr m == ×× × −− 10 911 10 219 10 81 0 31 6 . . . N 0.529 m kg ms . P23.12 The top charge exerts a force on the negative charge x e d 2 2 2 ch + which is directed upward and to the left, at an angle of tan F H G I K J
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